Balancing apparatus



May 29, 192s. 1,671,468

G. M. EATON BALANC I NG APPARATUS 'Filed Aug. 6, 1923 INVENTOR 'eage Ma/00 ATTORNFY Patented May Z9, 1928.

FECE- GEORGE IVI. EATON, OF /VILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC &; MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

BALANCING' Arrima'rus.Vv

Application filed August 6, 1923. Serial No.` 655,914.

My invention relates to balancing apparatus and particularly to means for balancing rotors, such as the armatures of dynamoelectric machines and more especially to a 5 design of motor housing which will permit of balancing the rotor while journaled therein.

It is among the objects of my invention toV provide a simple design of motor housing I which is provided with facilities for mounting the saine on a device which comprises a plurality of pedestal blockson which the motor housing issupported with a plurality of spring members interposed at one end and l* having gpivotal supports at its other end,

such is disclosed inthe copending application of Carl Richard Soderberg, Serial No. 651,231 tiled July 13, 1923, and assigned to the Westinghouse Electricaiul Manufacturing Company. l

The motor frame is providedwith eXtension lugs which have the two-fold function of providing supports for seating the frame on the pedestals and of providing mounting J lugs by which they are secured in position in service. This invention is especially applicable to motors utilized in railway service which are spring borne at one end and axle hung 'on their other ends, the usual-provision being made for axle bearings on which the frame is supported. z

In the accompanying drawingsl constituting a part hereof and in which like reference characters designate like parts,

Fig. 1 is a view, partially in plan and partially in section, of a motor mounted on suitable blocks in accordance with the principles of rnyinvention, and j Fig. 2 is a view, partially in end elevation and partially in section, showing the motor frame supported by y a plurality of coil springs and having a dial indicator associated therewith, and

Fig. 3 is a fragmentary end view showing position of the indicator. j

Referring to Fig. 1, the structure therein illustrated comprises the motor housing 1 having an armature 2 journalled by its shaft 3 in the end brackets 4t thereof. The motor frame is provided with a plurality of eX- tension lugs 5 on one side and similar lugs 6 in alinement therewith on its opposite side. The lugs 5 and 6 may be utilized for securr ing journal bearings byy which the motor is mounted on a vehicle or for any other type of mounting. The lugs 5 and 6 are provided with `screw-threaded openings adaptedto receive bolts 7 which have helical coil springs 8 disposed'therearound to provide' a resilient support, for the puropse of testing the dynamic balance of the armature 2.

The. motor frame 1 is mounted on a plu-j rality of pedestal blocks 9 which are secured to a bed plateor the like in spaced relation to be in alinement and register with the lugs y5 and 6 of the motor frame. vThe ad-` justable screw bolts 7`are` provided with lock nuts 10 and are adapted to extend through the openings provided inthe lugs 5 and't.r

`The coil springs 8 are seatedv on vbolts l1 screwed into the tops ofthe pedestals 9. rlhe boltsv 11'are provided with spherical lseating surfacesv which' engage the correspondingly shaped endsof the bolts 7.

The object of this arrangement of bolts is to permit of vertical adjustment to alternately support one side of the motoren the springs 8 and the otherside on the ends of the screw bolts 7 thereby providing a spring mounting on oneend anda pivotal lsupport on the votheriend to give the motor l a Asingle degree of freedom. A dial indicator`12 is ysecured to the pedestal 9 on the side of the motor Iwhich is supported on the springs 8 and a contact rod 13 f the lindicator is brought into engagement with the motor indicate oscillatory movement i frame to thereof. y p

The armature 2 is lactuated `in the usual way by energizing the field winding of the motor to cause it to rotateand any unbala-nce in the rotating mass will ,be indicated by the oscillation of the frame`at its springsupported end Vwhich is a result of the moment' of inertia or the product of the unbalanced mass by its distance from the pivot at the opposite screw bolts 7. V j

If the springs 8 are calibrated to produce a predetermined deflection for a given load, the reading of the dial indicator 12 will indicate the relative amount of unbalance and the correction for thisv unbalance may be -made by the addition of weights to the armature in two opposite transverse planes.

lhen a reading isvobtained and necessary 105 correction weights are'applied, the frame is raised at the spring-supported end to rest upon the ends of the screws 7 and the screw bolts on the opposite endsare adjusted to lower t-he opposite side of the motor frame u@ on its respective springs 8. lThe dial indill Si cator kl2 is removed to theopposite side of the motor `and the operation is repeated. The necessary correction is made by adding kweights in the transverse plane on the oppo n site end, which may be readily done by a cut-and-try method.

`An adjustable counter-balancing device may be utilized in conjunction with this scheme and other means of marking and indicating the location and amount of unbalance, such as are wel-l known in the art, may be utilizedl in conducting this method of balancing rotors. l

It will be obvious to those skilled in the art that various modifications may be made in carrying out the application of my invention without departing from the principles hereinset forth. y .g

I claim asy my invention l l.`A device for balancing dynamo-electric machines lhaving threaded vsupporting lugscomprisinfr supporti-ng ymembers provided withl spheri'calseats, springs interposed between said lugs, and the supporting members, and bolts having correspondingly shaped ends for engaging the spherical seats 1 to lift [the machine from the resilient ele.

and threadsfor engaging the threaded supporting lugs.

2. The combination with a dynamo-electric machine comprising" a housing and a rotorA within the housing, said housing being provided with supporting members in transverse planes that pass through positions on the rotor adapted for attaching balancing weights of a base member, spring elements disposed between kthe supporting members andv theA base member and pivot elements adapted to be interposed between the supporting members and the base. member.

A3. The combination with a dynamo-.electric machine provided with supporting niembers by which the machine is mounted, said members beingy also adaptable as pivot seats for balancing said machine `of pivot memA bersfforengaging some of said supporting members and spring members for resiliently supporting other of said supporting members. l

4'. The combination with a dynamo-electric -Inachine` rovided with supporting members by which the machine is mounted, said members being also adapt-able as spring and .pivot yseats for vbalancing said machine of spring and pivot members for engaging the supporting members.

5. A device for testing the imbalance of a rotor assembled in a permanent housing which comprises supporting members on the housing in planes adapted forI attaching correction lweights to Ithe rotorffor pivot and spring locating seats and spring and pivot members for mounting said housing by said supporting members in such a manner as to permit vertical oscillatorymotion thereof. y e

6. A device for testing the imbalance of a rotor assembled in a permanent housing which comprises supporting members on the housing -in planes containing positions for attaching correction weights to the rotor for pivot and spring locating seats v,and spring and pivot members for mounting said housing by said supportingmembers in such a manner as to permit oscillatory motion there of with reference to an arbitrary axis.

7. The combination with a dynamo-electric machine having supporting lugs disposed in two transverse planes thereof, of a base member, resilient elementsinterposed between said lugs and the base member and pivot members attached to the supporting lugs, said pivotv members beingl adjustable ments. I

8. rl`he combination with la dynamo-electric machine provided with supporting members disposed in transverse planes thereof, of pivot members for engaging the supporting members in one transverse plane and spring members for supporting the machine in another transverseplane, 'said pivot and spring members being interchangeable.

9. The combination with a dynamo-electric machine provided with supporting'members disposed in transverse planes thereof, of combination pivot and spring members for supporting the machine in two transverse planes, said pivot and spring members being adjustable to function either as pivots or as resilient supporting means.

10. The combination with a dynamo-electric machine provided with supporting members disposed in transverse planes thereof,

of pivot means for engaging the supporting y 

